Question

The concentration of petrol in three different mixtures (petrol and kerosene) is 1/2 , 3/5 and 4/5 respectively. If 2 litres, 3 litres and 1 litre are taken from these three different vessels and mixed. what is the ratio of petrol and kerosene in the new mixture?

A) 4:5 B) 3:2 C) 3:5 D) 2:3

Answer 1

Answer:

1/2*2+3/5*3+4/5*1=1+9/5+4/5=18/5

6-18/5=12/5

therefore, ratio= 18/12=3/2=3:2